Not as a general rule. Earth's rotation produces the Coriolis effect, which can influence water circulation differently in the two hemispheres. But hemisphere alone does not determine the direction of an ordinary draining sink, bathtub or toilet.
In household plumbing, the water's existing motion, the basin's shape and the direction of incoming jets normally overwhelm the much weaker Coriolis effect. Water can therefore drain clockwise or counterclockwise in either hemisphere.
Carefully controlled experiments can reveal the hemispheric effect by suppressing other movements and allowing slow drainage. Large, long-lasting ocean flows are also influenced by Earth's rotation. The misleading step is treating these conditions as a rule for every small whirlpool.
The Coriolis effect is real, but an ordinary drain cannot reliably reveal which hemisphere you are in.
Alistair B. Fraser, Penn State
Fraser explains that filling, disturbance and toilet jets determine ordinary drainage rotation. He also documents a Northern Hemisphere sink draining clockwise.
Based on: Penn State — Alistair B. Fraser · Live Science
Live Science
Reporting describes Northern and Southern Hemisphere experiments that produced opposite drainage rotations after researchers carefully suppressed competing disturbances.
Based on: Live Science
Alistair B. Fraser, Penn State
The expert explanation distinguishes long-lasting ocean vortices and carefully prepared drainage experiments from rapidly draining household sinks.
Based on: Live Science · Penn State — Alistair B. Fraser
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